JP2004230253A - Pulverizing plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulverizing plant which can efficiently catch and recover fine iron masses and iron pieces mixed in a pulverized matter, can improve working efficiency and can reduce maintenance cost. <P>SOLUTION: In the pulverizing plant, charged matters to be pulverized are successively pulverized by a plurality of pulverizers and are conveyed between the pulverizers by a conveying means to obtain minute pulverized matters from the matters to be pulverized. The pulverizing plant is constituted of a screw conveyer connected with a first pulverizer, an air conveying means having a conveyance tube which is connected with the screw conveyer at its lower part and is disposed upward, a second pulverizer connected with the air conveying means, a filter connected with the second pulverizer, a blower which is connected with a filter, attracts and air-conveys minute pulverized matters in the second pulverizer and pulverized matters in the air conveying means, an air intake port provided at a lower end part of the conveyance tube of the air conveying means, a valve disposed at the air intake port and a pocket disposed at the lower end part of the conveyance tube of the air conveying means. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pulverizing plant, in particular, pulverized material to be pulverized into a pulverized product by a plurality of pulverizers, while removing foreign matter in the pulverized material between the pulverizer, such as air and screw. The present invention relates to a pulverizing plant for transferring by a transfer means.
[0002]
[Prior art]
A large amount of cut grass generated during mowing work on a highway, a park, a garden, or the like is treated by incineration or the like. However, due to the generation of dioxin and carbon dioxide gas, the cutting of grass is a major environmental problem.
As a technique for solving the problems of the grass treatment and the growth of weeds, a weed control sheet produced by mixing finely pulverized grass with a biodegradable resin is known.
The weed deterrent sheet suppresses the growth of weeds by shading and penetrating resistance, prevents flying weed seeds from landing on the ground, and underground as the time elapses (for example, five years). Decomposed by bacteria, and leaves no trace after decomposition.
[0003]
For example, when planting a large number of ivy seedlings on a slope and planting to prevent the slope from collapsing due to wind, rain, earthquake, etc., apply ivy seedlings to the sheet at predetermined intervals from the weed suppression sheet spread on the slope. Plant seedlings while drilling holes.
Weed growth is suppressed by the weed suppression sheet, and by the time the weed suppression sheet is decomposed, ivy is growing on the slope, and weeds do not grow because ivy leaves cover the slope and shield light. Thus, the planting of the slope is completed without the necessity of performing the sheet collecting operation unlike the polypropylene sheet used for the conventional slope planting.
[0004]
The plant powder used as the base material of the weed suppression sheet is produced by a pulverizing apparatus as shown in FIG. 7 for processing powder from cut grass, pruned branches and the like.
The cut grass 1 and the rolled cut grass 2 are thrown into a bale chopper 5 and sheared into coarse-sized pulverized materials 6 (primary pulverization) so as to be easily transported by the belt conveyors 3 and 4. The coarsely pulverized material 6 subjected to the primary pulverization is conveyed by the belt conveyors 3 and 4 and is introduced into the hammer crusher 7 to be pulverized into a pulverized material 8 having a small size of, for example, about 7 mm (secondary pulverization). The secondary pulverized fine pulverized material 8 is conveyed by a screw conveyer 9 and introduced into an ultrafine pulverizer 10, and is pulverized into a pulverized material 11 having a fine size of, for example, about 0.5 mm or less (tertiary pulverization).
[0005]
The tertiary crushed fine pulverized material 11 is pneumatically conveyed by the drive of the blower 12 and collected by the bag filter 13, further conveyed by the screw conveyor 14 and the bucket conveyer 15, and put into the sieving machine 16. In the sieving machine 16, the fine pulverized material 11 has a uniform particle size of the powder, and the uniform pulverized material 17 is selected.
The uniform crushed material 17 is conveyed by a screw conveyor 18 and a bucket conveyor 19 and is bagged as a product. The crushed material 20 having a large particle size is conveyed by the screw conveyor 21 and the bucket conveyor 22 by the sieving machine 16, re-input into the ultrafine crusher 10 and crushed, and processed into a uniform crushed material 17. Since the uniform crushed material 17 is shipped as a raw material of a weed suppression sheet, it is not necessary to treat it by incineration or the like, which is a measure against environmental problems.
[0006]
During the process of processing the above-mentioned uniform crushed material 17, the crushed material such as the cut grass 1 and the pruned branches may contain foreign matter such as nails, wires, bolts, reinforcing bars, and empty cans. In such a pulverizing device, the iron lump and iron pieces as described above mixed in these pulverized materials are conveyed on the belt conveyor 4, and the magnetic separator 23 that adsorbs only the magnetic material (for example, Patent Document 1, 2).
[0007]
[Patent Document 1]
JP-A-6-344195 (page 3, FIG. 1)
[Patent Document 2]
JP-A-10-290940 (page 3, FIG. 1)
[0008]
[Problems to be solved by the invention]
However, the above-described conventional technique has the following problems.
Since the magnetic separator 23 is provided at a predetermined distance from the upper surface of the belt conveyor 4 so that the belt conveyor 4 conveys the coarse crushed material 6, the iron lump and the iron pieces mixed in the coarse crushed material 6 are provided. May not be adsorbed. That is, it is difficult for the magnetic separator 23 to remove all iron lump and iron pieces. For this reason, the iron lumps and iron pieces that cannot be removed may be crushed by the hammer crusher 7 into the coarse pulverized material 6, and the iron lumps and iron pieces may also be crushed and sent to the ultrafine crusher 10.
[0009]
In the ultrafine crusher 10, for example, by turning vortex by a plurality of rotor blades, fine crushed material is made into fine crushed material by impact crushing and grinding action, so if fine iron lumps and iron pieces are mixed, The rotor and liner inside the ultrafine crusher are damaged or damaged. As a result, the life of an expensive ultrafine crusher is extremely shortened, the repair man-hours are increased, and the crushing operation needs to be stopped during the repair. The parts cost etc. increase and the maintenance cost becomes expensive.
In addition, there is a problem that fine iron lump and iron pieces enter the inside of the ultra-fine pulverizer and continue to be pulverized.
[0010]
The present invention has been made by paying attention to the above problems, and relates to a crushing plant, in particular, a fine iron lump mixed with crushed material, an iron piece can be efficiently captured and collected, and work efficiency is improved, An object of the present invention is to provide a grinding plant that can reduce maintenance costs.
[0011]
Means for Solving the Problems, Functions and Effects
In order to achieve the above object, a first invention of a pulverizing plant according to the present invention is to pulverize the input pulverized material sequentially with a plurality of pulverizers, and to convey the pulverized material by transporting between the pulverizers with a conveying unit. In the pulverizing plant for converting the pulverized product into fine pulverized product, the fine pulverized product in the second pulverizer through the filter and the pulverized product of the first pulverizer in the air conveying means received from the screw conveyor through the second pulverizer When air is conveyed by sucking the air with a blower, foreign matters are dropped and accumulated in pockets due to the weight difference with the crushed material in the air conveying means.
[0012]
Alternatively, the second invention of the pulverizing plant, in the pulverizing plant to pulverize the input pulverized material sequentially with a plurality of pulverizers, and to convey the pulverized material between the pulverizers by a conveying means to make the pulverized material a fine pulverized material. A screw conveyer connected to the first crusher, a pneumatic conveying means having a conveying pipe connected downwardly to the screw conveyer, and arranged upward and a second conveyer connected to the air conveying means. A pulverizer, a filter connected to the second pulverizer, a blower connected to the filter to suck fine pulverized material of the second pulverizer and pulverized material of the air conveying means and convey the air, and a conveyance of the air conveying means The air inlet is provided at a lower end of the pipe, a valve is provided at the air inlet, and a pocket is provided at a lower end of the transfer pipe of the air transfer means.
[0013]
According to the above configuration, the pulverizing plant includes a blower that sucks fine pulverized matter in the second pulverizer through the filter, and a first pulverizer in the air conveying unit that is received from the screw conveyor through the second pulverizer. And the crushed material are sucked by the same blower. As a result, the installation area of the blower can be reduced, and the equipment cost can be reduced.
Further, in the pulverizing plant, the pulverized material finely pulverized by the first pulverizer is conveyed by air in the air conveying means, so that the pulverized substance is in a sufficiently scattered state, and the foreign matter easily falls away from the pulverized material due to a weight difference. . As a result, the amount of foreign matter entering the second pulverizer is extremely reduced, the life of the second pulverizer for finely pulverizing the pulverized material can be extended, the work efficiency is improved, and the cost of parts for repair is increased. Etc. can be reduced and maintenance costs can be reduced.
[0014]
In the pneumatic conveying means, foreign matter mixed in the pulverized material during the air conveyance is dropped by the upwardly directed conveying pipe due to a weight difference, and the foreign matter is stored in a pocket. For this reason, since a small iron lump and iron pieces which are easily ignited are less likely to enter the inside of the ultrafine pulverizer, it is effective in preventing ignition of a fine object to be pulverized.
In addition, since the lower end of the transfer pipe in the air transfer means is covered with a detachable or rotatable open / close lid, foreign objects such as iron lump and iron pieces stored in the pocket can be easily removed. As a result, the collection work becomes easier, the maintenance and management become easier, and the workability is improved.
In addition, since the pocket can be attached and detached with a single touch, the downtime of operation can be further reduced, and productivity can be improved.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a crushing plant according to the present invention will be described with reference to the drawings. The same parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.
First, a pulverizing plant 30 according to an embodiment will be described with reference to FIGS. FIG. 1 is a conceptual diagram of a crushing plant of the present invention, FIG. 2 is an enlarged view showing a conveying means of the crushing plant, FIG. 3 is a cross-sectional view of a pocket portion, and FIG. FIG.
[0016]
In FIG. 1, in a crushing plant 30, a hammer crusher 7 as a first crusher and an ultrafine crusher 10 as a second crusher are connected by a transfer device 31. The transfer device 31 is formed by a screw conveyor 32 and an air transfer device 33.
In FIG. 2, the screw conveyor 32 is disposed below the hammer crusher 7, and is mainly formed by a conveyor tube 35, a drive motor 37, and a screw 39. The screw conveyor 32 is connected to the hammer hopper 7 a of the hammer crusher 7 below the conveyor pipe 35 and to the air conveying device 33 above.
[0017]
Inside the conveyor tube 35, a screw 39 is provided, which rotates under the driving force of a drive motor 37 attached to the conveyor tube 35, and is crushed by the hammer crusher 7 and has a size of, for example, about 10 mm or less. The pulverized material 8 is received and sent to the air conveying device 33 by the screw 39.
The air conveying device 33 is disposed below the screw conveyor 32 and mainly includes a conveying pipe 41, an air valve 43, and a pocket 45. The transport pipe 41 has a lower part connected to the conveyor pipe 35 of the screw conveyor 32 and an upper part connected to the ultrafine crusher 10 via the hopper 10a for the ultrafine crusher.
[0018]
Further, the transport pipe 41 is connected to the conveyor pipe 35 at a lower portion with a smooth inclination, and is disposed with an inclination angle Θ gradually upward. This inclination angle Θ may be set to 90 degrees.
The transport pipe 41 is provided with an air intake 47 at a lower end surface portion 41 a, and an air valve 43 is provided at the air intake 47. The air valve 43 includes a gate valve, an angle valve, and the like, and adjusts the opening and closing amount to adjust the amount of air flowing into the transport pipe 41.
[0019]
The amount of air flowing through the conveying pipe 41 is such that fine pulverized material 8 is pneumatically conveyed through the conveying pipe 41, and metal and porcelain pieces such as iron lump, iron pieces, etc. mixed in the finely pulverized material 8 being conveyed by air. The flow rate is set such that the foreign matter 49 such as falls due to the weight difference.
Further, a pocket 45 is provided at a lower end of the transport pipe 41, and the pocket 45 is detachably attached to the transport pipe 41 with one touch and can be freely opened and closed. The pockets 45 are stored as foreign matters 49 in response to the metal pieces such as iron pieces, iron pieces and the like and the porcelain pieces mixed in the fine pulverized material 8 conveyed in the air due to the weight difference.
[0020]
For example, as shown in FIGS. 3 and 4, the pocket 45 has a lower end pipe portion 41 b fixedly provided near the lower end of the transport pipe 41 and beside the lower end transport pipe 41. A cup 51 is detachably attached to the portion 41b.
That is, the pocket 45 is formed by a U-shaped cup 51, and an L-shaped groove 51 a is formed at an upper end thereof, and the pocket 45 is detachably attached to the lower end tube portion 41 b of the transfer tube 41 with one touch. I have. After the L-shaped groove 51a is inserted into the pin 53 fixed to the lower end tube portion 41b of the transfer pipe 41, the cup 51 rotates along the horizontal groove by rotating, and then the small vertical groove is formed. Entered and held.
[0021]
This prevents the cup 51 from coming off the lower end tube portion 41b during the operation of the grinding plant 30. Further, the cup 51 can be attached to the transport pipe 41 with one touch, and is reliably held by the transport pipe 41.
Conversely, when removing the cup 51, the cup 51 is lifted up, the cup 51 is rotated when the pin 53 comes out of the small vertical groove and enters the horizontal groove, and when the pin 53 enters the vertical groove connected to the end, the cup 51 is removed. If it is lowered, the cup 51 can be easily removed from the transport pipe 41 with one touch. The foreign matter 49 in the cup 51 can be discarded by releasing the foreign matter 49 from the cup 51 after removal.
[0022]
The operation of the crushing plant 30 in the above configuration will be described.
In FIG. 1, in a pulverizing plant 30, first, the cut grass 1 and / or the rolled cut grass 2 put into the bale chopper 5 is sheared into a coarse-sized pulverized material 6. The coarse-sized pulverized material 6 is conveyed from the bale chopper 5 to the belt conveyors 3 and 4 and thrown into the hammer crusher 7.
The coarse-sized pulverized material 6 supplied to the hammer crusher 7 is pulverized into fine pulverized material 8 having a size of, for example, about 10 mm or less, and enters the screw conveyor 32 of the air transfer device 33 from the hammer hopper 7a.
[0023]
The fine crushed material 8 entering the screw conveyor 32 is transported by a screw 39 rotated by a drive motor 37 and enters the transport pipe 41 from the conveyor pipe 35.
The inside of the transfer pipe 41 is sucked by the blower 12 through the filter 13, the ultrafine pulverizer 10, and the hopper 10 a for the ultrafine pulverizer. The air is sucked in by the blower 12 and flows thereinto. Thus, the fine pulverized material 8 entering the transport pipe 41 is transported upward by the air from the air valve 43. At this time, foreign matter 49 such as iron lumps, iron pieces and the like and porcelain pieces mixed in the fine pulverized material 8 being conveyed by air are separated by the weight difference and fall and accumulate in the pocket 45.
[0024]
The fine pulverized material 8 from which the foreign matter 49 has been removed inside the transport pipe 41 enters the ultrafine pulverizer 10 via the ultrafine pulverizer hopper 10a connected above the transport pipe 41. In the ultra-fine pulverizer 10, the fine pulverized material 8 is pulverized into a fine pulverized material 11 of, for example, about 0.5 mm or less.
At this time, the fine pulverized material 8 entering the ultrafine pulverizer 10 has a very small amount of foreign matter 49 removed inside the transfer pipe 41, and therefore the chance of breaking or damaging the inside is very small. Thereby, the life of the ultrafine crusher 10 can be extended, the working efficiency can be improved, the cost of parts for repair can be reduced, and the maintenance cost can be reduced. In addition, there is no fire in the ultrafine pulverizer 10, so that ignition of a fine object to be pulverized can be prevented.
[0025]
The foreign matter 49 accumulated in the pocket 45 is removed from the transport pipe 41 with a single touch before starting the start at a predetermined time, after the end of the work, or before the start of each start, and the foreign matter 49 inside is discarded. .
The fine pulverized material 11 obtained by pulverization by the ultrafine pulverizer 10 is sucked by the blower 12 through the filter 13 and enters the sieving machine 16 via the filter 12 from the ultrafine pulverizer 10 as in the conventional case. The particles are sorted and the particle size is made uniform. The uniform crushed material 17 is conveyed by a screw conveyor 18 and a bucket conveyor 19 and is bagged as a product.
[0026]
Next, another embodiment of the pocket 45 will be described.
In FIG. 5, a pocket 45 is formed by a lid 61 and a lower end tube portion 41b of the transfer tube 41, and the lid 61 is rotatably attached to a lower end tube portion 41b of the transfer tube 41 by a hinge 63. The lid 61 is normally closed by a torque spring 65, and is opened by a handle 61a attached to the lid 61 as necessary. The lid 61 is automatically closed by releasing the handle 61a.
In this case, the foreign matter 49 is accumulated on the upper surface of the lid 61 inside the lower end tube portion 41b of the transport pipe 41 by closing the lid 61, and the foreign matter 49 is closed by opening the lid 61. Drop it from the top and release it with one touch. It is preferable that rubber is adhered or baked to the lid 61 so that the lid 61 is sealed with the lower end tube portion 41b of the transport tube 41.
[0027]
In FIG. 6, a pocket 51 is formed by a swing lid 71 and a lower end pipe part 41b of the transport pipe 41, and the swing lid 71 swings to a lower end pipe part 41b of the transport pipe 41 via an attachment pin 73. It is movably attached. The swinging lid 71 is normally closed by bringing the stopper 71a into contact with the locking projection 41c by a tension spring 75, and the handle 71a attached to the swinging lid 71 is swung in the W direction as necessary. It is made to open by doing.
The swing lid 71 is automatically closed by releasing the handle 71a. In this case, the foreign matter 49 is stored on the upper surface of the swinging lid 71 inside the lower end tube portion 41b of the transport pipe 41 by closing the swinging lid 71, and the foreign matter 49 is opened by opening the swinging lid 71. 49 is dropped from the upper surface of the swinging lid 71 so as to be released with one touch.
[0028]
In the above-described embodiment, an example is shown in which the transport pipe 41 is disposed with an inclination angle θ, an air intake 47 is provided at the lower end surface, and a pocket 45 is provided at the lower end side of the transport pipe 41. However, the conveying pipe 41 may have an inclination angle θ of 90 degrees, and an air inlet 47 may be provided at a lower end surface thereof, and a pocket 45 may be provided at a lower end side of the conveying pipe 41. Although the torque spring 65 is used in FIG. 5 and the tension spring 75 is used in FIG. 6, the tension spring 75 may be used in FIG. 5 and the torque spring 65 may be used in FIG. Although the handles 61a and 71a are used in FIGS. 5 and 6, the covers 61 and 71 may be gripped and opened and closed. Further, the pocket portion 5 may be provided with a screw on the lid and the lower end portion of the transport pipe 41 and screwed thereto, or a groove may be provided on the lower end portion, and the lid may be inserted into this groove. Alternatively, the cover may be opened and closed by sliding the cover.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a grinding plant according to the present invention.
FIG. 2 is an enlarged view showing a conveying means of the grinding plant according to the present invention.
FIG. 3 is a sectional view of a pocket portion according to the present invention.
FIG. 4 is an external view of a pocket portion according to the present invention, as viewed from Y in FIG. 3;
FIG. 5 is an external view of a pocket portion according to another embodiment of the present invention.
FIG. 6 is a plan view of a pocket portion of another embodiment according to the present invention.
FIG. 7 is a conceptual diagram of a conventional grinding plant.
[Explanation of symbols]
1, 2, cutting grass, 3, 4 belt conveyor, 5 bale chopper, 6 coarse ground material, 7 hammer crusher (first crusher), 8 fine ground material, 10 ultra fine crusher (second Pulverizer), 11: fine pulverized material, 13: bag filter, 16: sieve machine, 30: pulverizing plant, 31: transport device, 32: screw conveyor, 33: air transport device (air transport means), 35: conveyor Pipe, 37: drive motor, 39: screw, 41: transport pipe, 43: air valve, 45: pocket, 47: intake port.

Claims (2)

In the pulverizing plant to pulverize the input pulverized material sequentially with a plurality of pulverizers, and to convey the pulverized material into fine pulverized materials by conveying between the pulverizers,
When finely pulverized material in the second pulverizer through the filter and pulverized material in the first pulverizer in the air conveying means received from the screw conveyor through the second pulverizer are suctioned by a blower and air-conveyed. A crushing plant characterized in that foreign matter is dropped in a pneumatic conveying means due to a weight difference with the crushed material and accumulated in a pocket. In the pulverizing plant to pulverize the input pulverized material sequentially with a plurality of pulverizers, and to convey the pulverized material into fine pulverized materials by conveying between the pulverizers,
A screw conveyor connected to the first crusher;
Pneumatic conveying means connected to the screw conveyor below and having a conveying pipe arranged upward,
A second crusher connected to the air conveying means,
A filter connected to the second crusher;
A blower that is connected to the filter and sucks the fine pulverized material of the second pulverizer and the pulverized material of the air conveying means to convey the air;
An air intake port provided at a lower end of the transfer pipe of the air transfer means,
A valve arranged at the air intake,
A pulverizing plant comprising a pocket provided at a lower end of a conveying pipe of an air conveying means.

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